edits: show diff for sensitive edit confirmations

[connor4312]

Goes with microsoft/vscode-copilot-chat#1905

• Adds common markdown rendering to the IChatContentPartRenderContext.
  These have to get passed down everywhere that can render markdown
  'properly' and so this made sense, though we may want to revisit this
  and make them actual dependency-injected services with scope
  instantiation service.
• Add a new basic MarkdownDiffBlockPart and allow consumers to
  optionally enable that for handling of diff blocks in their markdown.
• Some further tweaks to deal with md/code in nested blocks.

Closes #266574

[vs-code-engineering]

📬 CODENOTIFY

The following users are being notified based on files changed in this PR:

@roblourens

Matched files:

• src/vs/workbench/contrib/chat/browser/chatListRenderer.ts

[Copilot]

Pull Request Overview

This PR adds support for displaying diffs in sensitive edit confirmations by enhancing markdown rendering capabilities across the chat interface.

Key Changes

• Added MarkdownDiffBlockPart to render inline diff blocks in markdown with unified diff format support
• Moved EditorPool and DiffEditorPool to a shared module (chatContentCodePools.ts) and added them to IChatContentPartRenderContext for better accessibility
• Updated BaseChatConfirmationWidget to use ChatMarkdownContentPart instead of basic markdown rendering to support code blocks and diffs in confirmation messages

Reviewed Changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
chatDiffBlockPart.ts	New file introducing parseUnifiedDiff function and MarkdownDiffBlockPart class for rendering inline diffs in markdown code blocks
chatContentParts.ts	Extended IChatContentPartRenderContext with editorPool, diffEditorPool, codeBlockModelCollection, currentWidth, and codeBlockStartIndex fields
chatContentCodePools.ts	New file consolidating EditorPool and DiffEditorPool classes moved from chatMarkdownContentPart.ts and chatTextEditContentPart.ts
chatMarkdownContentPart.ts	Added diff block rendering support via allowInlineDiffs option; removed EditorPool class (moved to shared module)
chatConfirmationWidget.ts	Updated renderMessage to use ChatMarkdownContentPart for proper code block/diff support; added codeblocks and codeblocksPartId getters
chatListRenderer.ts	Updated to populate new IChatContentPartRenderContext fields and removed duplicate getCodeBlockStartIndex method
codeBlockPart.ts	Added horizontalPadding and isReadOnly fields to ICodeCompareBlockData; updated layout logic to account for horizontal padding
chatTextEditContentPart.ts	Removed DiffEditorPool class (moved to shared module); cleaned up imports
chatToolPostExecuteConfirmationPart.ts	Removed editorPool and currentWidthDelegate parameters; uses context fields instead
chatToolInputOutputContentPart.ts	Removed editorPool and width parameters; uses context fields instead
chatToolOutputContentSubPart.ts	Removed editorPool and width parameters; uses context fields instead
chatInputOutputMarkdownProgressPart.ts	Removed editorPool and currentWidthDelegate() call from constructor invocation
chatToolInvocationPart.ts	Removed editorPool and currentWidthDelegate arguments when creating post-confirmation parts
chatToolConfirmationSubPart.ts	Added trailing comma for consistency
chatTerminalToolProgressPart.ts	Updated import to use EditorPool from shared module
chatTerminalToolConfirmationSubPart.ts	Updated import to use EditorPool from shared module; added trailing comma
chatExtensionsInstallToolSubPart.ts	Changed codeblocks to getter returning fallback empty array; changed codeblocksPartId to getter with fallback
chatElicitationContentPart.ts	Added codeblocks and codeblocksPartId getters that delegate to confirmation widget
chatToolInvocationSubPart.ts	Changed codeblocksPartId from readonly field to getter
chatConfirmationWidget.css	Added CSS rule to hide toolbar for diff blocks shown within confirmations